The figure has been supposed to represent Rome seated on Britain. But the shield is not the oblong buckler of the Romans, but a round barbaric target.
So Tacitus speaks of "Submotis velut in aliam insulam hostibus" by Agricola's rampart. And Pliny says, "Alpes Gcrmaniam ab Italia submovent."
Corpus Inscript. Lat, vii. 1125.